Best rated electronic components information aggregation platform? Orthogonal frequency division multiple access OFDMA: Friends who are familiar with Wi-Fi should know that the empty port of Wi-Fi adopts orthogonal frequency division multiplexing (OFDM) modulation, that is, the whole bandwidth is composed of orthogonal subcarriers. In Wi-Fi 6, the 802.11 working group introduced OFDMA access from LTE. The addition of such an “A” word can be said to have brought a qualitative change to the network capacity. As shown in the figure on the left below, Wi-Fi 5-based OFDM can only allocate all the bandwidth in the channel to one user at any one time, even if that user’s data needs do not need to take up all the bandwidth. When other users connect to the network, they need to wait for the next sending opportunity window (TXOP). This is very inefficient in the use of channel resources, especially when there is a significant increase in equipment. Discover more info at 19pa217-nt.
From the perspective of automakers, semiconductors will not be enough until 2024,” read next to the big news in the April 30 edition of the Nikkei News. In this article, Intel CEO Pat Gelsinger said at its financial results conference on April 28 that “due to capacity and production equipment constraints, semiconductor shortages will last until at least 2024. How long will this shortage of semiconductors last? I began to think that, as Intel’s chief executive said, “at least until 2024”, the semiconductor shortage will not disappear, and the semiconductor shortage will last for a long time. In this article, I would like to discuss the basic principles. If we come to a conclusion first, we speculate that there will be a long-term shortage of traditional analog and power semiconductors in the future due to the following reasons.
In the onboard system shown in the figure above, the green rectangle represents the printed circuit board (PCB), and the small rectangles of various colors above represent various functional modules in the system, such as memory. The functions of these modules are implemented by independent silicon chips, and they are connected by metal traces on the PCB to finally form a complete system. The System-on-Chip refers to the realization of the functions of the entire system on a single silicon chip. The schematic diagram is as follows: As shown in the figure above, a system-on-a-chip (SoC) implements various functional modules such as storage, processing, logic, and interfaces in one chip, rather than requiring several different physical chips to be implemented like a system-on-board. Compared with system-on-board, SoC solutions are lower cost, enable faster and more secure data transfer between different system units, have higher overall system speed, lower power consumption, smaller physical size, and better reliability.
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